System of distribution.



N. w. STOREB. SYSTEM OF DISTRIBUTION.

APPLICATION FILED APR- 4, I9I4.

1,250,243. Patented Dec. 18, 1917.

For]. F/yfl WITNESSES: INVENTOR Q I w BY W ATTORNEY UNITED STATES PATENT OFFICE.

NORMAN W. STORER, OF PITTSBURGH, PENNSYLVANIA, ASSI GNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

SYSTEM OF DISTRIBUTION.

Application filed April 4, 1914.

To all whom it may concern:

Be it known that I, NORMAN W. SToRER, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Systems of Distribution, of which the following is a specification.

My invention relates to systems of distribution, and it has special reference to means for supplying a suitably low voltage to a receiving circult from a supply circuit of relatively high voltage.

The object of my invention is to provide simple and relatively inexpensive means of the above-indicated character that shall be compact and durable in construction and reliable and effective in operation.

In modern railway practice, high-voltage, direct-current systems are coming more and more into favor and new problems have arisen in this new field. One of the problems to be solved is the provision of a suitably low voltage for use in connection with the lighting and control systems, for example, inasmuch as such systems cannot be fed directly from the high-voltage system, as will be readily understood, and also inasmuch as at present, no simple dynamo-electric machine has been devised for direct operation from a voltage of, for instance, 2400 or 4800 volts.

According to my present invention, I pro vide a relatively simple apparatus for suplying the desired low voltage to the receivmg circuit above referred to. To accomplish the desired result, I connect a plurality of mechanically associated dynamo-electric machines in series-circuit relation across the high-voltage supply system and employ, preferably, the machine adjacent to the negative side of the system as a generator for supplying a relatively low voltage to the control and lighting systems. The generator may either be connected in circuit with the driving motors or it may be electrically independent thereof.

By the term driving motors, I mean motors that are employed in the usual way to drive some common mechanical load: for instance, an electric railway vehicle, an aircompressor, or any other suitable mechanical load.

While my invention is particularly adapted for use in electric railway systems, it will Specification of Letters Patent.

Patented Dec. 18, 191 '7.

Serial No. 829,436.

be understood that the apparatus may be employed in other relations.

In the accompanying drawing, Figure 1 is a view in elevation, of a plurality of dynamo-electric machines constructed and arranged in accordance with my invention; and Figs. 2, 3, 4, 5 and 6 are diagrammatic views of control systems embodying my invention.

' Referring to Fig. 1 of the drawing, the apparatus here shown comprises a plurality of suitable motor frame members 1 and 2 that are mechanically connected together by a suitable bridging member 3; a plurality of armatures 4 which are preferably disposed in pairs within the frames 1 and 2, respectively, and are severally provided with pinions 5 on shafts 6; and a gear'wheel 7 rotatively supported by the bridging member 3 and adapted to mesh with all of the pinions 5. In this way, all of the dynamoelectric machines are mechanically associated, and one or any other desired number may be employed as a generator or generators to be driven by the remaining machines as motors.

Reference may now be had to Figs. 2, 3 and 4, wherein various set of the armatures shown in Fig. 1 are illustrated as connected, in seriescircuit relation with their respective field windings, across a supply circuit 8 of relatively high voltage. The armature adjacent to the negative side of the supply circuit 8 is shown, in each case, as connected for employment as a generator, and a receiving circuit 9, comprising, for instance, a control system and a lighting system on an electric railway train, is connected to the machine that is adapted for use as a generator. In Fig. 2, the generator is shown as having both a series field winding 10 and a shunt field winding 11 provided with means for varying the resistance of its circuit, the armature and series field winding being connected in series with the remaining dynamoelectric machines.

g In Fig. 3 a field magnet winding 12 for the generator is connected in series-circuit relation with the other dynamo-electric machines across the supply circuit 8, and the armature of the generator is electrically independent of the supply circuit. In Fig. 4 the generator is illustrated as a self-excited machine, being provided with a variable shunt field circuit 13, and, consequently, being entirely electrically independent of the supply circuit 8.

In the system disclosed in Fig. 8 or Fig. 4 of the drawing, a wider range of voltage may be delivered to the receiving circuit by reason of the armature winding of the generator being conductively independent of the motor circuit. In case the generator cordingly, by locating the armature winding conductively independent of the motor circuit the same may be designed to supply a wide range of voltage in the receiving circuit.

In Fig. 5, the generating machine is provided with a series field winding 14, and a variable shunt field circuit 15, and is shown as connected in series-circuit relation with the armatures of the remaining dynamoelectric machines, which are provided with a common and variable shunt field circuit 16, that is connected across the generating machine. I

In Fig. 6, the two armatures and the corresponding series fields nearest to the negative side of the circuit are shown as adapted for useas generators, theother two machines being emplo ed as driving motors. A common shunt eld circuit 17 including a variable resistance 18, is provided for the two generating machines. It will be understood that by suitable design of parts, the voltage delivered to the receivin circuit 9 from the system of Fig. 6, may be the same as the voltage generated by the single machine illustrated in Figs. 2 to 5, inclusive, if desired.

I do not wish to be restricted to the specific circuit arrangements or number of dynamo-electric machines herein illustrated, but desire that only such limltations shall be imposed as are indicated in the appended claims.

I claim as my invention:

1. In an electrical system, the combina tion with a supply circuit, of a plurality of mechanically associated unitary dynamoelectric machines, certain of which are fed from said supply circuit for serving as motors to be independently connected to a copies or this patent may be obtained for common mechanical load, and at least one of which serves to generate current, and a receivingcircuit connected to said generator, the armature winding of the dynamo-electric machine which serves as a generator being conductively independent of the dynamo-electric machines which serve as metors.

2. In an electrical system, the combination with a supply circuit of relatively high voltage, of a plurality of mechanically associated unitary dynamo-electric machines having armature and field windings, certain of which are connected for serving as motors to be independently connected to a common mechanical load and are disposed in series-circuit relation across said supply circuit, and at least one of which is adapted to act as a generator, and a receiving circuit of relatively low voltage connected to said generator, the field winding of said generator being disposed in series-circuit relation with said motors and the armature winding thereof being conductively independent of said motors.

3. In an electrical system, the combination with a supply circuit ofrelatively high voltage,of a plurality of electric motors independently connected to a common mechanical load and connected in series-circuit relation across said supply circuit, a receiw ing circuit of relatively low voltage, and an electric generator having its armature mechanically associated with and conduc tively independent of the circuit of all of said motors and electrically connected to said receiving circuit.

4. Inan electrical system, the combination with a supplycircuit of relativelyhigh voltage, of a plurality of mechanically associated dynamo-electric machines for driving a common mechanical load, the machines being severally provided with armature windings and fieldwindings and all ofsaid windings but one armature winding being connected in series relation to thesupply circuit, an electrical load, and ineans for connecting the electrical load to the armature thatis not connected to the supplycircuit. l i 'i i In testimony whereof, I have hereunto subscribed my name this 30th day of March, .914.

NQRMAN W. STQBER.

\Vitnesses JAcoB STAIR, J12, B. B. Hints.

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